Spalding Labs Fly Parasitic Wasps
By Spalding Labs
Last reviewed: December 2025
Fly Predators are beneficial parasitic wasps that destroy fly pupae before they emerge, providing natural biological control without chemicals.
Overview
Fly Predators (also called fly parasites or parasitic wasps) are tiny beneficial insects that attack and kill pest fly pupae in the manure before adult flies emerge. They provide chemical-free fly control.
How They Work
Biological Control
Female parasitic wasps:
Target Species
Effective against:
Application Program
Regular Releases
Fly Predators are released:
Quantity
Number needed based on:
Advantages
No Chemicals
Completely natural control method with:
Complementary Strategy
Works alongside other control methods without interference.
Best Results Tips
Timing
Begin releases before fly season starts (early spring).
Placement
Release near manure accumulation areas, not in clean areas.
Consistency
Maintain regular releases throughout the season.
Sanitation
Reduce breeding sites through good manure management.
Species Selection
Spalding Labs provides mixed species matched to regional conditions and target flies.
Key Features
- Biological Control: Natural fly control using beneficial insects, not chemicals
- Targeted Delivery: Regular shipments throughout fly season customized to your needs
- Self-Dispersing: Wasps actively seek out fly pupae across your facility
- Cumulative Effect: Populations build over the season for increasing control
- No Resistance: Biological control mechanisms avoid resistance development
- Organic Compatible: Acceptable for organic dairy operations
Ideal For
Farm Types: Organic dairy farms, Pasture-based operations, Small to medium dairies, Farms near residential areas
Pricing Information
Here is the pricing information for Fly Parasitic Wasps:
Biological fly control using parasitic wasps released throughout fly season.
Pricing Model: Monthly release subscription program
Spalding Labs: 1-888-880-1579. Ships direct to farm on customized schedule.
Pros & Considerations
- Chemical-free fly control method
- Compatible with organic certification
- No resistance development possible
- Safe for animals, workers, and environment
- Cumulative effect builds throughout season
- Customized programs for your operation
- Requires commitment to full-season program
- Cannot eliminate 100% of flies alone
- Less effective if neighbors have untreated fly sources
- Takes time to establish effective populations
- Requires proper release protocols for best results
Evaluation Questions
Key questions to consider when evaluating Fly Parasitic Wasps:
- Are you pursuing organic certification?
- What is your current fly control program?
- How severe is your typical fly pressure?
- Are there neighboring fly sources you cannot control?
- Are you willing to commit to season-long releases?
- What is your budget for biological control products?
- Do you have concerns about chemical pesticide use?
- How will you distribute the parasites when they arrive?